
Your theme is surprisingly bright and definitely "out there". As a Sci-fi and Fantasy fan myself, it's nice to see a website such as yours on the web, I do have some constructive criticism as a regular net surfer though.
The table width/padding for your site is pushing your site's banner over to the right just a tad and you can tell where it ends. You may want to considering altering your banner to compensate or adjusting the CSS so your banner meets the left hand edge.
Second, I primarily use Firefox, but I also viewed the site with IE and saw that your Main Menu makes use of the cell-background/hover in your CSS. The color used is an obnoxiously startling blue and you may want to change the hex code to a dark purple to compliment the royal purple and bright green you are using for your theme.
Along with this, I think your site would appear more clean and uniform if the News matched your color scheme as well instead of using white and grey, (the grey which clashes violently with the orange links and has a tendency to hurt a viewer's eyes).
You may want to adjust the weight of your user's Log In menu and place it at the top of your right column for your user's convenience; if you require them to log-in to access other parts of your site.
I think that you have a good concept that is loaded with content, keep up the great work.